lnwallet: update CommitWeight to return taproot commit weight

lnwallet/commitment.go

@@ -464,13 +464,18 @@ func SecondLevelHtlcScript(chanType channeldb.ChannelType, initiator bool,
 
 // CommitWeight returns the base commitment weight before adding HTLCs.
 func CommitWeight(chanType channeldb.ChannelType) int64 {
-	// If this commitment has anchors, it will be slightly heavier.
+	switch {
-	if chanType.HasAnchors() {
+	case chanType.IsTaproot():
-		return input.AnchorCommitWeight
+		return input.TaprootCommitWeight
-	}
 
+	// If this commitment has anchors, it will be slightly heavier.
+	case chanType.HasAnchors():
+		return input.AnchorCommitWeight
+
+	default:
 		return input.CommitWeight
 	}
+}
 
 // HtlcTimeoutFee returns the fee in satoshis required for an HTLC timeout
 // transaction based on the current fee rate.